Patients with myasthenia gravis (MG) may suffer a worsening of symptoms upon exposure to a variety of medications. The relationship between MG and medication effects is complex. Some medications (such as penicillamine and α-interferon) appear to cause MG occasionally, while other drugs (such as aminoglycoside antibiotics and quinine) may lead to MG symptoms by simply unmasking a pre-existing mild case. In patients with known MG, there is a long list of drugs that are reported to be associated with increased …